Yuri I Vladimirovich (Russian: Юрий Владимирович), known under his soubriquet Yuri Dolgorukiy (Russian: Юрий Долгорукий, literally "Yuri the Long-Armed"; also known in various accounts as Gyurgi, Dyurgi, or George I of Rus), (c. 1099 – 15 May 1157) was a Rurikid prince and founder of the city of Moscow. He reigned as Velikiy Kniaz (Grand Prince) of Kiev from September 1149 to April 1151 and then again from March 1155 to May 1157. Yuri played a key role in the transition of political power from Kiev to Suzdal following the death of his elder brother Mstislav the Great in 1132.

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According to Vasily Tatishchev, Yuri was born in 1090 which would make him a son of Vladimir Monomakh's first wife Gytha of Wessex, a daughter of Harold Godwinson. However, according to the "Testament of Vladimir Monomakh" Gyurgi's mother died on May 7, 1107, while Gytha died on March 10 and probably in 1098. Thus, Yuri Vladimirovich could have been a son of his father's second wife Yefimia and been born between 1095/97 and 1102.

Although his birth date is uncertain, some chronicles report that Yuri's elder brother, Viacheslav, said to him: "I am much older than you; I was already bearded when you were born." Since Viacheslav was born in 1083, this pushes Yuri's birth to c. 1099/1100.

There is also a version that has his son Andrei Bogolyubskiy being born around 1111. It is doubtful that Yuri was at that time younger than 16 or 17.

The question of Yuri's birthday remains open. The date can be approximated to sometime in the 1090s.

In 1147, Yuri Dolgoruki had a meeting with Sviatoslav Olgovich in a place called Moscow. In 1156, Yuri fortified Moscow with wooden walls and a moat[1]. Although the settlement probably existed earlier, Dolgoruki is often called "The Founder of Moscow".

For all the interest he took in fortifying his Northern lands, Yuri still coveted the throne of Kiev. It is his active participation in the Southern affairs that earned him the epithet of Dolgorukiy, "the far-reaching". His elder brother Mstislav of Kiev died in 1132, and "the Rus lands fell apart", as one chronicle put it. Yuri instantaneously declared war on the princes of Chernigov, the reigning Grand Prince and his brother Yaropolk II of Kiev, enthroned his son in Novgorod, and captured his father's hereditary principality at Pereyaslav of the South. The Novgorodians, however, betrayed him, and Yuri avenged by seizing their key eastern fortress, Torzhok.

In 1147, Dolgorukiy resumed his struggle for Kiev and in 1149[1] he captured it, but in 1151 he was driven from the capital of Rus by his nephew Iziaslav. In 1155, Yuri regained Kiev once again. After presumably being poisoned at the feast of a Kievan nobleman, Yuri unexpectedly died in 1157[1] which sparked anti-Suzdalian uprising in Kiev. Yuri Dolgoruki was interred at the Saviour Church in Berestovo, Kiev, but his tomb is empty.

The Primary Chronicle records the first marriage of Yuri on 12 January 1108. His first wife was a daughter of Aepa Ocenevich[2], Khan of the Cumans. Her paternal grandfather was Osen. Her people belonged to the Cumans, a confederation of pastoralists and warriors of Turkic origin.

His second wife Helena survived him and moved to Constantinople. Her paternity is not known for certain but Nikolay Karamzin was the first to theorise that Helena was returning to her native city. She has since been theorised to be a member of the Komnenos dynasty which ruled the Byzantine Empire throughout the life of Yuri.